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Q # 1
Measuring wavelengths with a CD, A LASER beam of wavelength λ = 632.8nm shines at normal incidence on the reflective side of a compact disc. The track of tiny pits in which information is coded onto the CD are 1.60μm apart. For what angles of reflection (measured fro m normal) will the intensity of light be maximum? Marks = 7
Q # 2
The plate on the back of a certain computer scanner says that the unit draws 0.34A of current from a 120V, 60Hz line. Find (a) the root mean square current (b) the current amplitude (c) the average current (d) the average square current.
Q # 3
Give several examples of electromagnetic waves that are encountered in everyday life. How are they all alike? How do they differ? Marks = 5
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question 2 answer :
given that
current drqwn by a computer scanner I = 0.340A
voltage = V = 120v
frequency f = 60Hz
power in the scanner P = VI
= 40.8W
resistance in the scanner R = V/I = 352.9Ω
a) root mean square current Irms = √P/R
= 0.34A
b) max current I max = Irms * √2 = 0.480A
c) average current Iavg = 0.6366 * Imax = 0.3055A
d) average square current = ( Irms)2 = 0.1156A
Question 3 answer(From yahoo Answer)
--Gamma rays are emitted by thallium nuclei during stress tests for heart disease.
A.O.A
please some one share question no 1 of 5th assignment .......
If any one know about this plz share.
pls share 1st que solution here
pls share 1st que solution here
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